Data transmission method, base station, user equipment, and system

ABSTRACT

Provided is a data transmission method, a base station, a user equipment, and a system. The method includes: adjusting and determining a frame structure of each time unit within a preset duration; notifying a user equipment (UE) of the adjusted frame structure; and performing data transmission according to the adjusted frame structure.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a National Phase Application, filed under 35 U.S.C. 371, ofInternational Patent Application No. PCT/CN2017/107368, filed on Oct.23, 2017, which claims priority to Chinese patent application No.201610966244.4 filed on Nov. 4, 2016, contents of each of which areincorporated herein by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to transmission management technologiesin the field of communications and, in particular, to a datatransmission method, a base station, a user equipment, and a system.

BACKGROUND

The 5G (5th Generation) needs to solve some challenges posed by diverseapplication scenarios. For example, low-delay applications have highrequirements on the delay and need to provide users with amillisecond-level end-to-end delay. At the same time, in order toimplement forward compatibility in 5G communication, the support toservice adaptation is an inevitable trend. The service adaptation refersto allowing semi-static or dynamic configuration in uplink and downlinkconfiguration, so as to meet service load requirements or match thechange of service load. Therefore, how to support or implement flexibleduplex or dynamic time division duplexing (TDD) has not yet beenproposed in the discussion of the third generation partnership project(3GPP) standard.

SUMMARY

A summary of the subject matter is described hereinafter in detail. Thissummary is not intended to limit the scope of the claims.

The present disclosure provides a data transmission method, a basestation, a user equipment, and a system.

A data transmission method is provided in the embodiments of the presentdisclosure. The method includes the steps described below.

A frame structure of each time unit within a preset duration is adjustedand determined.

The adjusted frame structure is notified to a user equipment (UE).

Data transmission is performed according to the adjusted framestructure.

A data transmission method is provided in the embodiments of the presentdisclosure. The method includes the steps described below.

An adjusted frame structure sent by a base station is received.

Data transmission is performed according to the adjusted framestructure.

A base station is provided in the embodiments of the present disclosure.The base station includes a control unit and a communication unit.

The control unit is configured to adjust and determine a frame structureof each time unit within a preset duration.

The communication unit is configured to notify a UE of the adjustedframe structure; and perform data transmission according to the adjustedframe structure.

A UE is provided in the embodiments of the present disclosure. The UEincludes a receiving unit and a sending unit.

The receiving unit is configured to receive an adjusted frame structuresent by a base station.

The sending unit is configured to perform data transmission according tothe adjusted frame structure.

A data transmission system is provided in the embodiments of the presentdisclosure. The system includes a base station and a UE.

The base station is configured to adjust and determine a frame structureof each time unit within a preset duration, notify a UE of the adjustedframe structure, and perform data transmission according to the adjustedframe structure.

The UE is configured to receive the adjusted frame structure sent by thebase station, and perform the data transmission according to theadjusted frame structure.

A base station is provided in the embodiments of the present disclosure.The base station includes a storage medium and a processor.

The storage medium includes a group of instructions that, when executed,cause the processor to perform the included operations described below.

A frame structure of each time unit within a preset duration is adjustedand determined.

The adjusted frame structure is notified to a UE.

Data transmission is performed according to the adjusted framestructure.

A UE is provided in the embodiments of the present disclosure. The UEincludes a storage medium and a processor.

The storage medium includes a group of instructions that, when executed,cause the processor to perform the included operations described below.

An adjusted frame structure sent by a base station is received, and datatransmission is performed according to the adjusted frame structure.

A computer-readable storage medium is further provided in theembodiments of the present disclosure, and is configured to storecomputer-executable instructions which, when executed by a processor,implement any one of the above-mentioned methods.

A data transmission method, a base station, a user equipment, and asystem are provided in the embodiments of the present disclosure. Thebase station side can flexibly adjust the frame structure of each timeunit within the preset duration and send the adjusted frame structure tothe UE, so that the data transmission can be performed between the basestation and the UE according to the adjusted frame structure. Therefore,dynamic transmission of uplink and downlink data according to servicerequirements is implemented.

Other aspects can be understood after the drawings and detaileddescription are read and understood.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A is a flowchart 1 of a data transmission method according to anembodiment of the present disclosure;

FIG. 1B is a flowchart 2 of a data transmission method according to anembodiment of the present disclosure;

FIG. 2A is a schematic diagram 1 of resource allocation according to anembodiment of the present disclosure;

FIG. 2B is a schematic diagram 2 of resource allocation according to anembodiment of the present disclosure;

FIG. 3 is a schematic diagram 3 of resource allocation according to anembodiment of the present disclosure;

FIG. 4 is a schematic diagram 4 of resource allocation according to anembodiment of the present disclosure;

FIG. 5 is a flowchart 3 of a data transmission method according to anembodiment of the present disclosure;

FIG. 6 is a flowchart 4 of a data transmission method according to anembodiment of the present disclosure;

FIG. 7A is a structural diagram of a base station according to anembodiment of the present disclosure;

FIG. 7B is a structural diagram of a user equipment according to anembodiment of the present disclosure; and

FIG. 7C is a structural diagram of a system according to an embodimentof the present disclosure.

DETAILED DESCRIPTION

The processes of scheduling and hybrid automatic repeat request (HARQ)caused by dynamic change of uplink and downlink transmission should alsobe considered. For example, the base station sends downlink controlinformation (DCI) in a slot 1 to schedule a slot 3 and a slot 4 foruplink data transmission. Nevertheless, when downlink data with a higherpriority, such as a data packet of a downlink high-reliabilityultra-low-latency communication ultra reliable and low latencycommunications (URLLC) service, needs to be transmitted suddenly, orwhen strong interference is detected, how the base station operates tosatisfy the service requirements should be considered. For anotherexample, in the process of sending downlink data or sending thediscovery reference signal (DRS) in consecutive slots, a sudden uplinkscheduling request requires the base station to immediately allocate anuplink resource to the UE for sending a service data packet with ahigher priority. How to perform scheduling, how to notify the UE, andhow to process the HARQ of corresponding scheduled data by the basestation should be considered. Therefore, the implementation of flexibleduplex and relevant signaling design corresponding to different servicerequirements, as well as its impact on scheduling and subsequent HARQshould be considered.

The present disclosure will be described in detail below in conjunctionwith the drawings and examples.

A data transmission method is provided in the present disclosure. Asshown in FIG. 1A, the method includes steps described below.

In step 101, a frame structure of each time unit within a presetduration is adjusted and determined.

In step 102, the adjusted frame structure is notified to a UE.

In step 103, data transmission is performed according to the adjustedframe structure.

One aspect of the present disclosure is how to implement flexible duplexor dynamic TDD, how to determine uplink and downlink configuration andhow to perform indication.

First, the uplink and downlink configuration is adjusted and determinedby using at least one of:

a priority level of a data service;

a priority level of a channel, a signal or a link;

a sensing result of a carrier;

negotiation between adjacent cells; or

a capability of the UE.

The each configured time unit includes one of: a subframe, a slot, amini-slot, or the number m of orthogonal frequency division multiplexing(OFDM) symbols. Here, m is an integer greater than or equal to 1.

The step of notifying the UE of the adjusted frame structure includes atleast one of:

indicating the adjusted frame structure through physical layersignaling;

configuring the adjusted frame structure through higher-layer signaling;or

notifying the adjusted frame structure through multicast signaling or asystem message.

For example, the base station notifies the UE of the uplink and downlinkconfiguration or further a blank resource through at least one of: asystem information block (SIB), a physical broadcast channel (PBCH),radio resource control (RRC), or dynamic physical layer signaling suchas DCI. The blank resource represents a resource at least being not usedfor transmitting data information.

The step in which the frame structure is adjusted includes stepsdescribed below.

A first number of slots or mini-slots or OFDM symbols are configured foruplink transmission of uplink preset information. The uplink presetinformation includes at least one of: an uplink acknowledgement(ACK)/negative-acknowledgement (NACK), a scheduling request (SR), asounding reference signal (SRS), a preamble initial access, or an uplinkretransmitted data packet.

A second number of slots or mini-slots or OFDM symbols are configuredfor downlink transmission of downlink preset information. The downlinkpreset information includes at least one of: a downlink control channel,a synchronization channel, a downlink broadcast channel, or a discoveryreference signal (DRS).

A third number of slots or mini-slots or OFDM symbols are configured asreserved resources or as blank resources. The blank resources representresources at least being not used for transmitting data information.

That is to say, the semi-static and dynamic signaling indication adoptsleast one of the following manners.

Manner 1:

Two adjacent base stations negotiate and then semi-statically configurecertain time domain positions for transmission of downlink or uplinkimportant information. For example, certain slots or OFDM symbols areconfigured for transmission of an uplink ACK/NACK, an SR, an SRS, apreamble initial access or a retransmitted data packet. Certain slots orOFDM symbols are configured for transmission of a downlink controlchannel, a synchronization channel, a DRS signal or the like. Then, thebase station may dynamically indicate remaining time domain resource tobe used for uplink, downlink or used as blank resource.

Manner 2:

A ratio set, or a pattern, or a ratio set and a pattern is configured,and an index of the ratio set, or an index of the pattern, or an indexof the ratio set and the pattern is indicated through dynamic signaling.Some ratio sets, or some patterns, or some ratio sets and patterns aresemi-statically configured, and the index of the ratio sets, or theindex of the patterns, or the index of the ratio sets and the patternsis dynamically indicated.

Manner 3:

A size of a subframe group/slot group is configured, and uplink anddownlink configuration of each subframe/slot in each subframe group/slotgroup is dynamically indicated. A size of a subframe/slot group issemi-statically configured, and uplink and downlink configuration ofeach subframe/slot in each subframe/slot group is dynamically indicated.

The uplink grant information includes information of a time domainposition at which uplink data transmission is scheduled, and thedownlink grant information includes information of a time domainposition at which downlink data transmission is scheduled.

The base station performs the above dynamic indication further in thefollowing included manners.

An uplink time domain position is determined according to uplink grantinformation for scheduling uplink data; and a downlink time domainposition is determined according to downlink grant information forscheduling downlink data.

Uplink and downlink configuration information of subsequent k slots or mmini-slots is indicated or the subsequent k slots or m mini-slots areindicated as blank resources through downlink control information bornin a common search space of a downlink control channel.

Manner 1: A time domain position of uplink data is implicitly determinedaccording to uplink grant information for scheduling the uplink data;and a time domain position of downlink data is implicitly determinedaccording to downlink grant information for scheduling the downlinkdata.

Manner 2: Uplink and downlink attribute of subsequent k slots ormini-slots are indicated or a certain slot is indicated as a blankresource, and an attribute of each OFDM symbol in a mixed slot isindicated through downlink control information born in a common searchspace of a downlink control channel.

The common control information is sent in a control area of a predefinedor configured downlink time unit or is sent in each downlink time unit.

Manner 3: A change of an uplink and downlink configuration attribute ofa subsequent t-th slot or s-th mini-slot is indicated or the subsequentt-th slot or s-th mini-slot is indicated as a blank resource throughspecific downlink control information born in a specific search space ofthe downlink control channel, where t and s are positive integers.

In particular, for the structure of the mixed slot including both uplinkand downlink, a secondary indication is used for determining each symbolto be uplink or downlink or the blank resource.

First-level DCI indicates the length of each mini-slot, and second-levelDCI indicates the uplink and downlink or the blank resource of eachmini-slot.

In particular, for the carrier aggregation scenario, the method ofdynamically adjusting uplink and downlink configuration is applicable toall cells, and uplink and downlink configuration indication informationof a secondary cell (Scell) is sent on a downlink control channel of aprimary cell (Pcell), or is sent only on a downlink control of theScell.

For the dual-link scenario, the uplink and downlink configurationindication information of the Scell may also be sent on a downlinkcontrol channel of a primary secondary cell (PScell).

Another aspect of the present disclosure is how to treat with impact onscheduling and HARQ, and steps described below may be included.

A slot n or a mini-slot in the slot n for downlink data transmission isadjusted to be the slot n or the mini-slot in the slot n for uplink datatransmission.

A slot m or a mini-slot in the slot m for the uplink data transmissionis adjusted to be the slot m or the mini-slot in the slot m for thedownlink data transmission.

The slot n or the mini-slot in the slot n for the downlink datatransmission is adjusted to be a blank resource.

The slot m or the mini-slot in the slot m for the uplink datatransmission is adjusted to be the blank resource.

For example, since the slot n or a certain mini-slot in the slot n istemporarily and dynamically adjusted for sending a service having a highpriority level in the uplink or adjusted for coordinating interferencebetween adjacent cells, a certain downlink data packet scheduled to beoriginally transmitted in the slot n or the certain mini-slot in theslot n may be processed in one of the following manners.

A data packet originally sent in the slot n or the mini-slot in the slotn is discarded, and the data packet being corrupted is indicated to aterminal, where scheduling is not counted in the number ofretransmissions; or a data packet originally sent in the slot m or themini-slot in the slot m is discarded, and the data packet beingcorrupted is indicated to the terminal, where scheduling is not countedin the number of retransmissions.

The data packet to be originally sent in the slot n or the mini-slot inthe slot n and the data packet to be originally sent in the slot m orthe mini-slot in the slot m are sent in a manner of reduced power or areduced modulation coding scheme (MCS).

The data packet to be originally sent in the slot n or the mini-slot inthe slot n, or the data packet to be originally sent in the slot m orthe mini-slot in the slot m is rescheduled to another resource; or thedata packet to be originally sent in the slot n or the mini-slot in theslot n and the data packet to be originally sent in the slot m or themini-slot in the slot m are rescheduled to another resource fortransmission.

The data packet to be originally sent in the slot n or the mini-slot inthe slot n, or the data packet to be originally sent in the slot m orthe mini-slot in the slot m is sent on a reserved resource; or the datapacket to be originally sent in the slot n or the mini-slot in the slotn and the data packet to be originally sent in the slot m or themini-slot in the slot m are sent on the reserved resource. Theabove-mentioned reserved resource and another resource may substantiallybe time domain resources, or frequency domain resources, or time domainresources and frequency domain resources, and another resource and thereserved resource may refer to different resource positionsrespectively.

That is to say, in a method 1, the data originally sent at the positionis directly discarded, and the terminal is indicated that the datapacket is corrupted, thereby avoiding the influence of retransmissionand merging. ACK/NACK is not fed back and scheduling is not counted inthe number of retransmissions.

In a method 2, the data packet is still sent with reduced power or witha low MCS.

In a method 3, the data packet is rescheduled to another time domainposition, or another frequency domain position, or another carrier.

The feedback of ACK/NACK may be processed as described below.

When the re-indicated data transmission position is located later thanthe original position of the ACK/NACK feedback, the DCI information alsoincludes new resource position information of the ACK/NACK feedbackcorresponding to the data packet, and the new position of the datapacket and the corresponding position of the ACK/NACK are indicated in amanner of joint coding.

Manner 4: The base station sends the data packet on some reserveddownlink resources.

Since the slot m or a certain mini-slot in the slot m is temporarily anddynamically adjusted for sending a service having a high priority levelin the uplink or adjusted for coordinating interference between adjacentcells, a certain uplink data packet scheduled to be originallytransmitted in the slot m or the certain mini-slot in the slot m may beprocessed in one of the following manners.

Transmission of the data packet originally transmitted in the slot isdirectly relinquished.

The UE continues to blindly detect DCI indication information fortriggering transmission. After the indication information for triggeringtransmission is detected again, the UE sends the prepared data packet atthe indicated position again.

A timer is set. When new trigger information is received within the timeinterval set by the timer, transmission is performed according to theindication information. When no new trigger information is receivedwithin the time interval set by the timer, the data packet is discarded.

Other time-frequency resources includes: a physical resource block (PRB)position or a new slot position, or further includes a codebook or anorthogonal code resource. For example, trigger transmission signalingthat indicates a new scheduling position is sent to the UE originallyscheduled at the position. The new scheduling position includes a newPRB position or a new slot position or further includes a codebook or anorthogonal code resource.

The UE sends the data packet on some reserved uplink resources.

The treatment with impacts on scheduling and HARQ timing includes stepsdescribed below.

For the scenario of semi-static configuration scheduling and feedbacktiming, the subframe for data transmission is determined according tothe reference subframe configuration and the configured timing value; orthe original semi-static configuration timing is switched to dynamicindication timing; and for dynamic signaling indication timing, thetiming indication is re-modified.

In addition, different subbands in a bandwidth are configured to havedifferent uplink and downlink configurations, and when adjacent twosubbands have different uplink and downlink configurations, a guardbandis provided between the adjacent two subbands.

Different subbands in a large bandwidth may be configured to havedifferent uplink and downlink configurations. When adjacent two subbandshave different uplink and downlink configurations, a guardband may beprovided between the adjacent two subbands to avoid adjacent frequencyinterference. The base station notifies the UE of the uplink anddownlink configurations of different subbands in a time-frequencytwo-dimensional manner.

Preambles of certain signals/channels such as discovery referencesignals (DRSs)/random access channels are sent in a transmission window,and transmission positions of these signals may be dynamically adjustedfor transmission of a service having a high priority level.

A data transmission method is further provided in the presentdisclosure, and is applied to a UE. As shown in FIG. 1B, the methodincludes steps described below.

In step 201, an adjusted frame structure sent by a base station isreceived.

In step 202, data transmission is performed according to the adjustedframe structure.

After the adjusted uplink and downlink configuration information orframe structure sent by the base station is received, the method furtherincludes the step described below.

When the UE determines a change of uplink and downlink configurationinformation in a time unit corresponding to the uplink and downlinkconfiguration information or the frame structure according to the uplinkand downlink configuration information or the frame structure, anoriginally scheduled data packet is processed as follows.

The UE blindly detects new scheduling information of the base stationwithin predefined time. The new scheduling information is scrambled byusing a specific identifier. The new scheduling information indicatesthat the originally scheduled data packet is rescheduled to another timedomain position, another frequency domain position, another carrier,another codebook, or another orthogonal code resource.

When control information of the rescheduling has not been detectedwithin the predefined time, the UE relinquishes sending or receiving ofthe data packet, or the UE sends or receives the data packet on somereserved resources.

Based on the above, the present disclosure provides the followingexamples.

Example 1

The example describes in detail how the base station notifies the UEsubject thereto of the link direction, or the uplink/downlink/blankresource attribute.

The base station notifies the UE of the uplink and downlinkconfiguration by using at least one of the following information: anSIB, a PBCH, a RRC, and dynamic physical layer signaling such as DCI.

For example, the uplink and downlink attribute at a certain moment isdetermined in one of the following manners.

Manner 1: The system specifies certain fixed time domain positions suchas certain fixed slots or OFDM symbols for sending the uplink ACK/NACK,SR, SRS or preamble initial access or retransmitted data packet.

For example, a slot 1 is used for sending the SR, the last OFDM symbolof a slot 4 is used for sending the SRS, and a slot 5 is used forsending a message 1 or a preamble signal in a random access process. Thelast OFDM symbol of a slot 8 is used for sending the ACK/NACK.

Meanwhile, certain slots or OFDM symbols are fixedly used for sendingcertain downlink data or information.

For example, the first OFDM symbol of a slot 0 is fixedly used forsending the downlink control channel, the slot 4 is used for sending thedownlink synchronization channel, and a slot 7 is used for sending theDRS.

The base station may then dynamically indicate whether the remainingresources other than the fixed resources are uplink or downlink or blankresources.

Manner 2: Two adjacent base stations negotiate and then semi-staticallyconfigure certain time domain positions for transmitting downlink dataor uplink data.

For example, a cell 1 and a cell 2 are two adjacent cells. When the twoadjacent cells belong to the same base station, the base station maysemi-statically configure, through higher-layer signaling according torequirements, certain time domain resources for transmitting uplink dataor downlink data.

When the two adjacent cells belong to different base stations, the twobase stations may exchange information via an air interface, and thennotify the UE in the cells through the higher-layer signaling of thenegotiated uplink and downlink attribute of the time domain position.

For example, the adjacent base stations negotiate and determine that inthe adjacent two cells, the slot 1 is used for sending the SR, the lastOFDM symbol of the slot 4 is used for sending the SRS, and the slot 5 isused for sending the message 1 or the preamble signal in the randomaccess process. The last OFDM symbol of the slot 8 is used for sendingthe ACK/NACK. The first OFDM symbol of the slot 0 is used for sendingthe downlink control channel, the slot 4 is used for sending thedownlink synchronization channel, and the slot 7 is used for sending theDRS.

Then, the base station dynamically adjusts or configures the remainingtime domain resources according to the uplink and downlink servicerequirements.

Manner 3: All resources are dynamically indicated by the base station.

Manner 4: A part of the resources are fixedly used for uplink datatransmission or downlink data transmission, and a part of the resourcesare semi-statically configured for uplink data transmission or downlinkdata transmission or as blank resources, and a part of the resources areused for dynamically indicating uplink data transmission or downlinkdata transmission or blank resources.

The base station performs the above dynamic indication further in thefollowing included manners.

Manner 1: A time domain position of uplink data is implicitly determinedaccording to uplink grant information for scheduling the uplink data;and a time domain position of downlink data is implicitly determinedaccording to downlink grant information for scheduling the downlinkdata. That is, uplink data is scheduled to the time domain position foruplink data transmission, and downlink data is scheduled to the timedomain position for downlink data transmission.

The uplink grant information and the downlink grant information are bornin a specific search space of the downlink control channel. The downlinkcontrol channel is located on the first few OFDM symbols of certainslots that are semi-statically configured or fixed.

Manner 2: Signaling notification is displayed through common controlinformation.

For example, downlink control information is carried in a common searchspace of the downlink control channel to indicate uplink and downlinkattribute of subsequent k slots or mini-slots or to indicate a certainslot as a blank resource, and an attribute of each OFDM symbol in amixed slot.

For example, the bitmap is used for indicating whether the subsequent kslots or mini-slots have uplink attribute or downlink attribute. 0represents the uplink and 1 represents the downlink. Or inversionrepresents a change of the uplink and downlink attribute of the slot orthe mini-slot. No inversion represents no change of the uplink anddownlink attribute of the slot or the mini-slot. If a bit correspondingto a slot changes from 0 to 1, it means that the uplink and downlinkattribute is changed. Otherwise it means that the attribute of the slotis not changed.

Manner 3: A slot whose configuration changes is notified throughspecific control information.

For example, 3 bits or 4 bits in the DCI indicate the slot or themini-slot whose configuration has changed, and 1 bit indicates a changebetween uplink and downlink or the resource becoming a blank resource.For example, when the 1 bit is 0, it indicates that the uplink anddownlink attribute of the slot or the mini-slot changes, and when the 1bit is 1, it indicates that the slot or the mini-slot is a blankresource.

Manner 4: Some uplink and downlink frame structure patterns and thegranularity of slot allocation changed by the base station arepredefined or semi-statically configured through higher-layer signaling,and then the base station dynamically indicates indexes of the patterns.

For example, a size of the slot group is semi-statically configured tobe 4, and then the uplink and downlink configuration of every 4 slots isnotified through dynamic DCI signaling. The notification may also be ina manner of notifying the index of the uplink-downlink ratio. As listedin Table 1 below, each ratio index corresponds to an uplink-downlinkratio. Configuration of each slot is determined by one-to-onecorrespondence in the order of first the downlink slot and then theuplink slot. What is missing is a blank slot. If both uplink anddownlink slots exist, the blank slot is located between the downlinkslot and the uplink slot.

TABLE 1 Corresponding Index Signaling uplink-downlink ratio 1 000 0:4 2001 1:3 3 010 2:2 4 011 3:1 5 100 4:0 6 101 3:0 7 110 0:3 8 111 2:1

The UE determines the receiving or transceiving of data or thereservation of resources at each time moment by receiving the aboveinformation.

Through the above method, the UE can accurately know the direction ofdata transmission, so as to correctly receive or transmit data.

Example 2

The example describes in detail the situation in which the uplink anddownlink configuration in the frame structure is dynamically changed.

The uplink and downlink configuration in the frame structure includesreserving or configuring some blank resources.

In addition to a dynamical change of the uplink and downlink attributeof a subframe or a slot or a mini-slot or several OFDM symbols, the basestation may also dynamically indicate some blank resources and instructthe UE not to send any data on the blank resources during the datatransmission.

These blank resources include n consecutive PRBs for the frequencydomain, and include one or more slots or one or more OFDM symbols withina slot for the time domain. For example, the base station indicates,through the bitmap, in the common control information DCI of the firstOFDM symbol of a slot which ones or which one of the remaining six OFDMsymbols among the seven OFDM symbols included in the slot are reserved.

The reserved or blank resource positions are used for at least one ofthe following.

The UE does not receive data at the reserved position.

The reserved or blank resource positions are used for a site to senseand listen for interference.

The reserved or blank resource positions are used for dynamic adjustmentof receiving and sending.

The reserved or blank resource positions coexist with the traditionalsystem.

Some resources are reserved for sending data packets that are not sent.

The reserved or blank resource positions are used for sending multicastservices.

The position of the blank symbol may also be semi-statically configuredthrough higher-layer signaling, with the frequency domain positionoccupying a part of the bandwidth.

The position of the blank symbol may be located between transmissions ofuplink data and downlink data or between two mini-slots.

The requirements of the system for forward compatibility and flexibleadjustment of resources are satisfied by configuring these blankresources.

The step in which the base station notifies the uplink and downlinkconfiguration further includes: semi-statically configuring a size of aslot group, and then indicating uplink and downlink configuration ineach slot group through dynamic signaling.

As shown in FIG. 2A, the size of a slot group initially configured bythe base station is 4 slots. Then, the dynamic DCI indicates that theuplink-downlink ratio in the first slot group is 0:4, and the predefinedarrangement sequence is first the downlink slot and then the uplinkslot. It means that the first slot to the fourth slot are all downlink.For another example, the DCI indicates that the uplink-downlink ratio inthe second slot group is 2:1, and then among the four slots, the firstslot is downlink, the second slot is blank, and the third and fourthslots are uplink. Then, the size of the slot group is semi-staticallychanged to be 2 slots through the higher-layer signaling. And theuplink-downlink ratio in the first slot group is indicated to be 1:1through the dynamic signaling, which means that the first slot isdownlink and the second slot is uplink. Then, the uplink-downlink ratioin the second slot group is 2:0, which means that the first slot isdownlink, and the second slot is also downlink.

The signaling overhead can be reduced in this indication manner.

Example 3

The example describes the granularity and adjustment of dynamic TDD.

The base station determines the uplink and downlink attribute at acertain moment by using at least one of the followings.

A priority level of a data service is used. A service having a highpriority level is sent first, a corresponding uplink and downlinkattribute is configured to the data packet, and the final link directionof two data packets having the same service priority level and differentdirections is determined through contention.

A priority level of a channel or a signal is used. Different channelsand signals are divided into different priority levels throughpredefinition. A channel or signal having a high priority level are sentfirst, and then the base station broadcasts the corresponding uplink anddownlink attribute. A channel or signal having a low priority level isdelayed to be sent.

A sensing result of a carrier is used. Uplink and downlink datatransmission is determined according to a contention result of thecarrier.

A result of negotiation between adjacent cells is used. If an adjacentcell performs a high-priority-level downlink data transmission at acertain moment, the current cell should also be configured to performdownlink data transmission in order to avoid cross-link interference.

A capability of the UE is used.

The granularity of dynamical change of slot allocation of uplink anddownlink includes: the granularity of a subframe (1 ms), the granularityof a slot, the granularity of a mini-slot, or the granularity of n OFDMsymbols, where n is semi-statically configured or indicated throughdynamic signaling.

For example, it is assumed that the length of the mini-slot issemi-statically configured to be 2 OFDM symbols, and the structure of acertain slot is as shown in FIG. 2B. The length of the slot is 7 OFDMsymbols, and the first OFDM symbol is fixedly used for the downlinkcontrol channel and includes the uplink and downlink attribute of thesubsequent 3 mini-slots. For example, the bitmap is used for indicatingto the user equipment that the adjusted frame structure is 011, and thenthe first mini-slot is indicated to be downlink, and the remaining twomini-slots are indicated to be uplink.

Different subbands in a system bandwidth may be configured to havedifferent uplink and downlink configurations within the same timeperiod. For example, for a subframe, the uplink and downlinkconfiguration of a subband 1 is a configuration pattern 1, the uplinkand downlink configuration of a subband 2 is a pattern 2, and the uplinkand downlink configuration of a subband 3 is a pattern 3. Meanwhile aguardband is provided between subbands.

In the above manner, the uplink and downlink configurations of differentfrequency bands in the system bandwidth at different time may bedynamically adjusted.

Example 4

The example describes a situation in which the transmission of uplinkdata is adjusted to the transmission of downlink data.

The base station sends, in the slot 0, DCI information for continuousscheduling of multiple slots to the UE, and the DCI information is bornin the UE-specific search space. For example, as shown in FIG. 3, slots4, 5 and 6 are continuously scheduled for sending the uplink datapacket. While in the slot 2, the base station suddenly has a downlinkdata packet, such as a URLLC packet, having a high priority level to besent, and then the base station sends, in the common DCI of the slot 3,signaling for changing uplink and downlink configuration in a slot of aframe structure. Therefore, the slot 5 is changed to be downlink, andthen the base station sends downlink scheduling information to schedulethe URLLC data packet to be sent in the slot 5.

After all UEs detect the common indication information, the data packet,of the UE, scheduled in the slot 5 is processed in one of the followingmanners.

Manner 1: Transmission of the data packet in the slot 5 is relinquishedand directly discarded.

Manner 2: The data packet is sent in the slot 5 at a lower power.

Manner 3: The UE continues to blindly detect DCI indication informationfor triggering transmission. After the indication information fortriggering transmission is detected again, the UE sends the prepareddata packet at the indicated position again.

For example, the base station sends scheduling update signaling to theUE originally scheduled at the position. The scheduling update signalingindicates a new scheduling position which includes a new PRB position ora new slot position or further includes a codebook or an orthogonal coderesource. For example, the data packet originally scheduled in the slot5 is scheduled to the slot 6 for transmission, and an orthogonal codemay be configured at the same time.

Manner 4: The UE sends the data packet on some reserved uplinkresources.

The reserved resources are certain fixed resources or certainsemi-statically configured resources. For example, the slot 7 is areserved slot resource as a new position for transmission of a datapacket that is originally scheduled but is not sent.

Then the base station receives the data packet according to theindicated new position or reserved resource position.

This implements data transmission and reception in the case ofdynamically adjusting the uplink and downlink configuration.

Example 5

The example describes a situation in which the downlink datatransmission process is adjusted to be uplink transmission process.

The base station sends, on the first OFDM symbol of the slot 0, DCIinformation for continuous scheduling of multiple slots to the UE, andthe DCI information is born in the UE-specific search space. Forexample, as shown in FIG. 3, slots 0, 1, 2 and 3 are continuouslyscheduled for sending the downlink data packet. While in the slot 1, thebase station suddenly receives an uplink scheduling request sent by theUE to require the base station to immediately allocate an uplinkresource to the UE for sending a service data packet having a highpriority level. For example, the URLLC packet is to be sent, and thenthe base station sends uplink and downlink change signaling in thecommon downlink control information of the slot 2, and the slot 2 ischanged to be uplink. After the UE receives the common information, theUE that has a service with a high priority level may perform sensing oncertain resources of the slot. If the resource is not used, the uplinkdata may be sent in a grant-free manner. Or the base stationsimultaneously sends, in the specific search space of the controlchannel in the slot 2, grant information to the UE that sends thescheduling request, to indicate certain PRB resources of certain OFDMsymbols of the slot 2 and scheduling information such as the MCS. Forthe downlink packet originally scheduled at this position, the basestation may perform processing in one of the following manners.

Transmission of the data packet is relinquished, and meanwhile the UEdoes not receive the scheduled downlink data packet and does not feedback ACK/NACK.

The data packet is still sent at a lower power than the originaltransmit power.

The data packet is rescheduled to another time domain position, oranother frequency domain position, or another carrier.

A timer is set. If the indication information of rescheduling is stillnot received within the time interval set by the timer, the data packetis discarded.

For example, the base station resends DCI to the UE corresponding to thedownlink data packet originally scheduled at the position, and notifiesthe UE that the original data packet is resent in the slot 4, which maybe, for example, an offset of k slots from the original position, wherek=2.

If the re-indicated position is located later than the original positionof the ACK/NACK feedback, the DCI information may include new resourceposition information of the ACK/NACK feedback corresponding to the datapacket.

For example, the transmission position of the ACK/NACK feedbackcorresponding to the downlink data packet originally indicated in theslot 2 is the last OFDM symbol of the slot 3. Since the data packet ofthe base station in the slot 2 is not sent, the UE feeds back NACK ornothing in the slot 3.

If the base station re-indicates the position of the ACK/NACK feedbackcorresponding to the data packet as the slot 5, the UE feeds back thecorresponding ACK/NACK in the slot 5 according to the new indicationinformation after the UE receives the data packet in the slot 4.

Or the base station indicates the position of the new data packet andthe position of the corresponding ACK/NACK in a manner of joint coding.

The base station sends the data packet on some reserved downlinkresources.

The reserved resources are certain fixed resources or certainsemi-statically configured resources. For example, the slot 7 is areserved slot resource as a new position for transmission of a datapacket that is originally scheduled but is not sent.

This implements data transmission, reception and feedback in the case ofdynamically adjusting the uplink and downlink configuration.

Example 6

The example describes the process of data scheduling adjustment by thebase station in the process of sending the downlink synchronizationsignal and the measurement signal.

For example, the system defines that the downlink synchronization signaland the channel measurement signal may be sent in some predefined timewindows. It is assumed that the time window for transmission is 2 ms andincludes four slots, that is, these signals may have four possibletransmission positions in one transmission period, or may be transmittedin any one of the four slots. The base station may dynamically adjustthe transmission position of these signals according to the requirementsof the service priority level. As shown in FIG. 4, The base stationoriginally sends a downlink synchronization signal and a channelmeasurement signal, such as a DRS, in the slot 5, and suddenly an uplinkURLLC data packet is to be sent, and then the base station may sendcommon DCI information to notify that all or part of the OFDM symbols ofthe slot 5 are used for uplink URLLC service. At the same time, the DRSsignal is delayed to the next slot for transmission.

For example, the transmission position of a message 1 in the predefinedrandom access process is also some predefined time windows, that is, thesystem reserves certain resources for transmission of the uplinkpreamble initial access. If the base station has a downlink service witha high priority level to be sent, the base station may send common DCIinformation to notify that certain reserved resources are used fortransmission of downlink data with the high priority level, and then theUE may perform access on other reserved resources in the time window.Channel sensing measurement is performed before the access.

Example 7

The example describes ACK/NACK of the data packet.

When transmission of uplink and downlink data packets is dynamicallychanged, the size of the corresponding ACK/NACK playload may also bedynamically changed, and a resource and position of the ACK/NACKfeedback may be affected.

For example, if an ACK/NACK of m bits is to be fed back at a certainmoment and since an ACK/NACK corresponding to a newly added downlinkdata packet is also fed back at this moment, the number of bits of theACK/NACK will increase. Or the base station re-allocates another momentfor feeding back the ACK/NACK corresponding to the newly added downlinkdata packet.

A feedback resource of the ACK/NACK corresponding to the downlink datais determined in at least one of the following manners.

The last OFDM symbol or the first OFDM symbol of each of certain slotsis semi-statically configured as a resource for the uplink ACK/NACK.

For example, a slot includes 14 OFDM symbols, the base stationoriginally and continuously schedules m data packets in a schedulingunit of k (k may be 1, 2 or 4) OFDM symbols, and the ACK/NACK feedbackof the m data packets are all performed in the slot.

When the length of the uplink control channel bearing the ACK/NACK isone slot, the resource is determined in one of the following manners.

Manner 1: A position of the ACK/NACK corresponding to the data packet isimplicitly determined through a position of DCI corresponding to thescheduled downlink data packet.

Manner 2: The base station semi-statically configures a resource setthrough higher-layer signaling, and then indicates the time-frequencyresource through dynamic signaling.

In addition, when the size of the ACK/NACK payload is dynamicallychanged, the resource may be determined in the following manner. Tworesource positions are configured by the higher-layer and a threshold ispredefined. When the size of the ACK/NACK payload is greater than thethreshold, the ACK/NACK is sent at a resource position 1 or sent on along physical uplink control channel (PUCCH). When the size of theACK/NACK payload is less than the threshold, the ACK/NACK is sent at aresource position 2 or sent on a short PUCCH.

Example 8

The example describes the situation in which the URLLC service and theenhanced mobile broadband (eMBB) service are multiplexed andtransmitted.

It is assumed that the base station sends downlink control informationto a UE1 on the first OFDM symbol of the slot 1 to schedule a downlinkeMBB service for data transmission in slots 1, 2, 3 and 4 continuously.A UE2 suddenly has an uplink URLLC service to be scheduled in the slot2, and then the base station sends DCI information to the UE2 in theslot 3 to schedule transmission of the uplink URLLC data packet.Meanwhile the base station removes all eMBB data packets originallyintended to be sent in the slot 3, and sends control information to theUE1 on the last OFDM symbol of the slot 4 to notify that the eMBB datapacket in the slot 3 is corrupted. The UE1 may then perform interferencecancellation reception on the corrupted data after the UE1 receive thecontrol information.

Through the displayed signaling, retransmission of the entire eMBB datapacket is avoided, and the spectrum efficiency is improved.

Example 9

The example is directed to an impact of a dynamic change of uplink anddownlink on scheduling and HARQ timing.

It is assumed that the base station sends downlink control informationin the slot n to schedule four downlink slots from slot (n+1) to slot(n+4) for downlink data transmission, and meanwhile indicates throughdynamic signaling that the ACK/NACK corresponding to a data packet bornin each slot is fed back in a slot (n+5). The adjacent cell or thecurrent cell has uplink data with a high priority level to be sent inthe slot (n+4), so in order to ensure the performance of the data packetwith the high priority level, the base station temporarily sends commonDCI information to notify that the slot (n+4) is the uplink subframe.After the information is received, the UE managed by the base stationdoes not receive downlink data in the slot (n+4). The ACK/NACK is notfed back for the downlink data packet originally scheduled at theposition, where data transmission of the scheduling is not counted inthe maximum number of retransmissions. If new DCI information isreceived within the time interval set by the timer, the data packet isreceived according to the new indicated position, and the ACK/NACK isfed back at the corresponding position according to the indicationinformation.

Example 10

The example describes the process of URLLC scheduling and datatransmission.

The URLLC service may be accessed in a scheduling-based manner or in aschedule-free manner. When reception of the initial transmission has anerror and in order to reduce the delay, a retransmitted data packet ofthe UE is accessed in the schedule-free manner, or the UE performsaccess in the scheduling-based manner, and the indicated transmissiontiming is symbol-level. For example, the URLLC is scheduled in units of1 OFDM symbol, and the scheduling interval of two adjacent scheduling isvery small and is one or two OFDM symbols. The process of schedulingaccess may be that: the base station sends downlink DCI on the thirdsymbol of the slot 0 to notify the UE of transmission on a symbol 6 ofthe retransmitted data packet originally accessed in the scheduling-freemanner. The resource is notified by the base station through common DCI.After the DCI is received, all UEs will not send uplink data on theresource. The resource is a resource specific for schedulingretransmitted data packets, and will not be occupied by other UEs.

In addition, for the schedule-free UE, when the initial transmissionerror occurs or when the UE does not receive the ACK of the base stationwithin predefined time, the UE may perform retransmission according tothe predefined frequency-hopping pattern. The frequency-hopping patternis separated by k OFDM symbols in the time domain. k is less than apredefined threshold. A random frequency domain position is used.

Or the UE uses a different orthogonal code for each automatictransmission.

Or the base station allocates a frequency-hopping pattern of anautomatic retransmission when rescheduling is performed.

The above method is used to meet the requirements of low-delay services.

Example 11

The example describes the processing flow of the method, applied to thebase station side, provided by the present disclosure.

As shown in FIG. 4, first the base station determines an uplink-downlinkratio in a certain cell through negotiation with an adjacent site andaccording to its own uplink and downlink service requirements.

If a data packet having a high priority is to be sent in a cell 1 at acertain moment, the uplink and downlink attribute of the two cells isdetermined by the data packet. If the data packet is an uplink datapacket, uplink data transmission is performed in both the two adjacentcells at the moment. If the data packet is a downlink data packet,downlink data transmission is performed in both the two cells at themoment.

The processing flow on the base station side corresponding to theexample is described in conjunction with FIG. 5. When an uplink datapacket and a downlink data packet have the same priority level, theuplink and downlink attribute at the moment is determined throughcontention.

Then, the base station notifies the UE subject thereto of the determineduplink-downlink ratio.

The notification method includes higher-layer signaling, or dynamicphysical layer control signaling, or higher-layer signaling and dynamicphysical layer control signaling.

Then, downlink data is sent and uplink data is received according to theuplink and downlink positions.

During the process, the base station temporarily adjusts the uplink anddownlink attribute or the blank resource at a certain moment accordingto the service requirements or the measured interference status.

Example 12

The example describes the processing flow of the method, applied to theterminal side, provided by the present disclosure.

As shown in FIG. 6, first the terminal receives relevant informationabout the uplink and downlink configuration sent by the base station.

Then the terminal sends or receives data according to the configurationinformation.

The base station described in the present disclosure includes a Node B,an evolved base station (eNode B), a home Node B, a relay node (RN), amacro base station, a micro base station, and the like.

Based on the above description, a base station is further provided inthe present disclosure. As shown in FIG. 7A, the base station includes acontrol unit 71 and a communication unit 72.

The control unit 71 is configured to adjust and determine a framestructure of each time unit within a preset duration.

The communication unit 72 is configured to notify a UE of the adjustedframe structure; and perform data transmission according to the adjustedframe structure.

The each time unit includes one of: a subframe, a slot, a mini-slot, orthe number m of OFDM symbols. m is an integer greater than or equal to1.

The control unit is configured to notify the UE of the uplink anddownlink configuration information or the frame structure by using atleast one of:

indicating through physical layer signaling;

configuring through higher-layer signaling; or notifying throughmulticast signaling or a system message.

The control unit is configured to adjust and determine the uplink anddownlink configuration through at least one of the followings:

a priority level of a data service;

a priority level of a channel, a signal or a link;

a sensing result of a carrier;

negotiation between adjacent cells; and

a capability of the UE.

The adjusted frame structure includes structures described below.

A first number of slots or OFDM symbols are configured for uplinktransmission of uplink preset information. The uplink preset informationincludes at least one of: an ACK/NACK, an SR, an SRS, a preamble initialaccess, or an uplink retransmitted data packet.

A second number of slots or OFDM symbols are configured for downlinktransmission of downlink preset information. The downlink presetinformation includes at least one of: a downlink control channel, asynchronization channel, or a DRS.

A third number of slots or mini-slots or OFDM symbols are configured asreserved resources or as blank resources. The blank resources representresources at least being not used for transmitting data information.

The control unit is configured to perform at least one of followingoperations.

A ratio set, or a pattern, or a ratio set and a pattern is configured,and an index of the ratio set, or an index of the pattern, or an indexof the ratio set and the pattern through dynamic signaling is indicated.

A size of a subframe group/slot group is configured, and uplink anddownlink configuration of each subframe/slot in each subframe group/slotgroup is dynamically indicated.

The indication through physical layer signaling includes steps describedbelow.

An uplink time domain position is determined according to uplink grantinformation for scheduling uplink data; and a downlink time domainposition is determined according to downlink grant information forscheduling downlink data.

Uplink and downlink configuration information of subsequent k slots or mmini-slots is indicated or the subsequent k slots or m mini-slots areindicated as blank resources through downlink control information bornin a common search space of a downlink control channel.

A slot n or a mini-slot in the slot n for downlink data transmission isadjusted to be the slot n or the mini-slot in the slot n for uplink datatransmission.

A slot m or a mini-slot in the slot m for the uplink data transmissionis adjusted to be the slot m or the mini-slot in the slot m for thedownlink data transmission.

The control unit is configured to perform one of following operations.

A data packet originally sent in the slot n or the mini-slot in the slotn is discarded, and the data packet being corrupted is indicated to aterminal, where scheduling is not counted in the number ofretransmissions; or the data packet originally sent in the slot m or themini-slot in the slot m is discarded, and the data packet beingcorrupted is indicated to the terminal, where scheduling is not countedin the number of retransmissions.

The data packet to be originally sent in the slot n or the mini-slot inthe slot n, and the data packet to be originally sent in the slot m orthe mini-slot in the slot m are sent in a manner of reduced power or areduced MCS.

The data packet to be originally sent in the slot n or the mini-slot inthe slot n and the data packet to be originally sent in the slot m orthe mini-slot in the slot m are rescheduled to another time-frequencyresource.

The data packet to be originally sent in the slot n or the mini-slot inthe slot n and the data packet to be originally sent in the slot m orthe mini-slot in the slot m are sent on the reserved resource.

Another time-frequency resource includes: a PRB position or a new slotposition, or further includes a codebook or an orthogonal code resource.

The uplink and downlink configuration further includes a step describedbelow.

Different subbands in a bandwidth are configured to have differentuplink and downlink configurations, where when adjacent two subbandshave the different uplink and downlink configurations, a guardband isprovided between the adjacent two subbands.

The control unit is further configured to perform operations describedbelow.

A signal/channel of a preset type is sent in a specified window.

When a signal/channel having a higher priority level than thesignal/channel of the preset type is sent, the signal/channel having thehigher priority level than the signal/channel of the preset type is sentin the specified window.

In addition, a UE is further provided. As shown in FIG. 7B, the UEincludes a receiving unit 81 and a sending unit 82.

The receiving unit 81 is configured to receive adjusted uplink anddownlink configuration information or an adjusted frame structure sentby a base station.

The sending unit 82 is configured to perform data transmission accordingto the adjusted frame structure.

The UE further includes an adjustment unit 83.

The adjustment unit 83 is configured to: when a change of uplink anddownlink configuration information in a time unit corresponding to theuplink and downlink configuration information or the frame structure isdetermined according to the uplink and downlink configurationinformation or the frame structure, an originally scheduled data packetis processed as follows.

New scheduling information of the base station is blindly detectedwithin predefined time.

The new scheduling information is scrambled by using a specificidentifier. The new scheduling information indicates that the originallyscheduled data packet is rescheduled to another time domain position,another frequency domain position, or another carrier.

When control information of the rescheduling has not been detectedwithin the predefined time, the UE relinquishes sending or receiving ofthe data packet, or the UE sends or receives the data packet on somereserved resources.

An indication system is further provided in the present disclosure. Asshown in FIG. 7C, the system includes a base station 91 and a UE 92.

The base station 91 is configured to adjust and determine a framestructure of each time unit within a preset duration, notify a UE of theadjusted frame structure, and perform data transmission according to theadjusted frame structure.

The UE 92 is configured to receive the adjusted uplink and downlinkconfiguration information or frame structure sent by the base station,and perform the data transmission according to the adjusted uplink anddownlink configuration information or frame structure.

A base station provided in the present disclosure includes a storagemedium and a processor.

The storage medium includes a group of instructions that, when executed,cause at least one processor to perform the included operationsdescribed below.

A frame structure of each time unit within a preset duration is adjustedand determined.

The adjusted frame structure is notified to a UE.

Data transmission is performed according to the adjusted framestructure.

A UE provided in the present disclosure includes a storage medium and aprocessor. The storage medium includes a group of instructions that,when executed, cause at least one processor to perform the includedoperations described below. An adjusted frame structure sent by a basestation is received, and data transmission is performed according to theadjusted frame structure.

A computer-readable storage medium is further provided in theembodiments of the present disclosure, and is configured to storecomputer-executable instructions which, when executed by a processor,implement any one of the above-mentioned methods.

It should be understood by those skilled in the art that functionalmodules/units in all or part of the steps of the method, the system andthe device disclosed above may be implemented as software, firmware,hardware and appropriate combinations thereof. In the hardwareimplementation, division of the functional modules/units mentioned inthe above description may not correspond to division of physicalcomponents. For example, one physical component may have severalfunctions, or one function or step may be executed jointly by severalphysical components. Some or all components may be implemented assoftware executed by processors such as digital signal processors ormicrocontrollers, hardware, or integrated circuits such as applicationspecific integrated circuits. Such software may be distributed on acomputer-readable medium, which may include a computer storage medium(or a non-transitory medium) and a communication medium (or a transitorymedium). As is known to those skilled in the art, the term, computerstorage medium, includes volatile and nonvolatile, removable andnon-removable media implemented in any method or technology for storinginformation (such as computer-readable instructions, data structures,program modules or other data). The computer storage medium includes,but is not limited to, a random access memory (RAM), a read-only memory(ROM), an electrically erasable programmable read-only memory (EEPROM),a flash memory or other memory technologies, a compact disc read-onlymemory (CD-ROM), a digital versatile disc (DVD) or other optical discstorage, a magnetic cassette, a magnetic tape, a magnetic disk storageor other magnetic storage devices, or any other medium used for storingdesired information and accessed by a computer. In addition, as is knownto those skilled in the art, the communication medium generally includescomputer-readable instructions, data structures, program modules orother data in modulated data signals such as carriers or othertransmission mechanisms, and may include any information deliverymedium.

The above are only exemplary embodiments of the present disclosure andare not intended to limit the scope of the present disclosure.

INDUSTRIAL APPLICABILITY

A data transmission method, a base station, a user equipment, and asystem are provided in the embodiments of the present disclosure. Thebase station side can flexibly adjust the frame structure of each timeunit within the preset duration and send the adjusted frame structure tothe UE, so that the data transmission can be performed between the basestation and the UE according to the adjusted frame structure. Therefore,dynamic uplink and downlink data transmission according to servicerequirements is implemented.

What is claimed is:
 1. A method for wireless communication, comprising:configuring, by a base station, a group of slot structures via ahigher-layer signaling; determining, by the base station, a structure ofeach slot within a preset duration; notifying, by the base station, auser equipment (UE) of the determined structure via a physical layersignaling, wherein the physical layer signaling includes downlinkcontrol information that is carried in a search space of a commondownlink control channel indicating uplink or downlink configurationinformation for subsequent k slots, wherein k is a positive integer, andwherein notifying the UE comprises: dynamically indicating the uplink ordownlink configuration of each slot based on a corresponding slotstructure in the group of slot structures via the physical layersignaling; and performing a data transmission according to thedetermined structure.
 2. A method for wireless communication,comprising: receiving, by a user equipment (UE), configurationinformation about a group of slot structures via a high-layer signalingfrom a base station; receiving, by the UE, a structure of each slotwithin a preset duration from the base station via a physical layersignaling, wherein the physical layer signaling includes downlinkcontrol information that is carried in a common search space of adownlink control channel indicating uplink or downlink configurationinformation for subsequent k slots, wherein k is a positive integer,wherein receiving the structure of each slot comprises dynamicallyreceiving, by the UE, the uplink or downlink configuration of each slotbased on a corresponding slot structure in the group of slot structuresvia the physical layer signaling; and performing a data transmissionaccording to the scheduling information.
 3. The method of claim 2,wherein the method further comprises: monitoring, by the UE, schedulinginformation from the base station within a predefined time; scrambling,by the UE, the scheduling information using a specific identifier,wherein the scheduling information indicates a time domain position fortransmitting a data packet.
 4. A device for wireless communication,comprising: a processor; and a memory for storing instructionsexecutable by the processor, wherein the processor is configured to:configure a group of slot structures via a higher-layer signaling;determine a structure of each slot within a preset duration; and notifya user equipment (UE) of the determined structure via a physical layersignaling, wherein the physical layer signaling includes downlinkcontrol information that is carried in a common search space of adownlink control channel indicating uplink or downlink configurationinformation for subsequent k slots, wherein k is a positive integer,wherein the processor is configured to notify the UE based on:dynamically indicating the uplink or downlink configuration of each slotbased on a corresponding slot structure in the of slot structures viathe physical layer signaling, and perform data transmission according tothe adjusted frame structure.
 5. A device for wireless communication,comprising: a processor; and a memory for storing instructionsexecutable by the processor, wherein the processor is configured to:receive configuration information about a group of slot structures via ahigh-layer signaling from a base station; receive a structure of eachslot within a preset duration from a base station via a physical layersignaling, wherein the physical layer signaling includes downlinkcontrol information that is carried in a search space of a commondownlink control channel indicating uplink or downlink configurationinformation for subsequent k slots, wherein k is a positive integer,wherein the processor is configured to receive the structure of eachslot based on dynamically receiving the uplink or downlink configurationof each slot based on a corresponding slot structure in the group ofslot structures via the physical layer signaling; and perform a datatransmission according to the structure.
 6. The device of claim 5,wherein the processor is configured to: monitor scheduling informationfrom the base station within predefined time; scramble the schedulinginformation using a specific identifier, wherein the schedulinginformation indicates a time domain position for transmitting a datapacket.